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(No Model.)

G. GIBBS.

ALARM LOCK.

No. 379,642. Patented Mar. 20, 1888.

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shall sound an alarm.

UNITED STATES PATENT Orricn.

GEORGE GIBBS, OF PATERSON, NEW JERSEY, ASSIGNOR OF ONEHALF TO ISAAC SMITH, OF SAME PLACE.

ALARM- EPECIPICATION forming part of Letters Patent No. 379,642, dated March 20, 1888.

Application filed December 29, 1887. Serial No. 259,350.

To all whom it may concern:

Be it known that I, GEORGE GIBBS, a subject of the Queen of Great Britain, residing at Paterson, Passaic county, State of New Jersey, have invented a new and useful Improvement in Alarm-Locks, of which the following is a specification, reference being had to the accompanying drawings, forming a part thereof.

My invention relates to looks for trunks, chests, tills, &c., and has for its object the construction of an alarm-lock wherein every action of the key upon the lock mechanism My invention consists in certain features of construction and combination of parts, as will be hereinafter fully described, and pointed out in the claim.

Figure 1 of the drawings is a part sectional elevation of the lock, in which figure a portion of the covering-plate is removed; and Fig. 2is an elevation of thesame, the covering-plate being entirely removed in such figure.

A represents an alarm-lock for trunks, chests, tills, 850., having the usual guide-pin, a, fastening-plate b, rim 0, and covering-plate c. On the guide-pin a, which is adapted to guide the key a in position to act upon the lock mechanism, is arranged a revolving ward, (J. This revolving ward G is composed of a wheel por tion having a series of engaging lugs or teeth, d, and a stem portion adapted to receive and accommodate the key a of the look A. The wheel portion of the ward O is arranged to fit the guide-pin a and revolves against the plate I), while the stem portion of the same is cut to fit the wards in the key on the under side of the stem, and is therefore adapted to be turned by the key a in the operation of locking and unlocking.

In position to be acted upon by the lugs or teeth d of the revolving ward isacam, e,which cam is arranged partly behind a plate, i, on a pin, J, which pin passes through plate 2' and holds the same in position while the pin is fixed in the fastening-plate I). On a stud, K, more remote from the center of motion, is arranged a hammer, g, which hammer passes horizontally over the cam e and in position to be acted upon by the same, and extends to a gong, h, which gong is fixed on astud, 72/, held by a screw, If, said stud h being fastened in (No model.)

the plate I) of the look A. The hammer g is provided with aspring, g, which spring bears on the upper side thereof and acts to throw said hammer into forcible contact with the gong, the spring being arranged on a stud, g", fixed in the fastening-plate I). On a stud, n fixed in the plate I), is arranged a tumbler, n, that rests on the plate t, which tumbler has a spring portion, t", and a projecting catch portion, it, and is arranged to be acted upon by the key a, and is located partly behind a bolt, S, which bolt slides against the rim 0, when moved by the key a, and is engaged by the projecting catch portion a of the tumbler. The bolt S is provided with depending lugs t t, the former to be acted upon by the key a in unlocking the device and the latter to beacted upon by the key when looking the same, while the bolt has arranged on its upper edge notches 1' r, for engagement with the tumbler.

The key a is inserted in the key-hole a and is turned forward with the revolving ward, which action puts the lugs 01 of the ward 0 into engagement with the cam e, four of which lugs d will have engaged the cam and caused the latter to raise the hammer g to be thrown by the spring 9, in each one of the four engagements required in unlocking, into contact with the gong h, and thus sound four alarms on the gong in the operation. When three of the en gaging-lugs (l of the revolving ward C have acted upon the cam and three alarms have been given by the action of the hammer on the gong actuated by the spring g on the escape of the cam from the action of the ward, the key a will then be in position to throw the bolt S to the right-hand side, having previously acted upon the tumbler a and lifted the catch n out of the notch 1' preparatory to throwing the bolt S by engaging the lug tthereof, as seenin Fig. 2, which, when done, the fourth alarm will be given by the action of the hammer on the gong caused by the spring under the fourth action of the ward O on the cam e. The bolt S having been thrown in the manner stated, the catch a enters the notch 1-, and the lock-plate m is freed from the bolt S and the lock is unlocked. The bolt having been thrown and the lock unlocked, the key a will be between lugs 25 t of the bolt S and in position to engage lug t of said bolt and throw the same to the left-hand side and lock the look by sounding one alarm on the gong by the action of the ward C on the cam e, in the manner before stated; but three additional alarms will be given before 5 the key a will be in position to be withdrawn from the look through key-hole a. Thus it will be seen that when the key a is inserted in the look through the key-holea four alarms will be sounded in the operation of locking to or unlocking, and that no action can be had by the key on the lock mechanism without the sounding of an alarm by the gong.

A greater or a less number of engaging-lugs d may be arranged on the wheel portion of the I 5 ward G, by which a less or greater number of alarms are given in the operation of locking and unlocking without changing materially the nature of my invention; hence I do not 4 confine myself to this particular construction 20 of the wheel portion of the ward 0.

Having describedmy inventiomwhatlcla'im as new, and desire to secure by Letters Patent, in a lock for trunks, chests, tills, &c., is

The combination, with the revolving ward having lugs'd thereon and a key for turning 2 said ward, of the tumbler n, the bolt S, having notches r r and lugs t t, the cam e, the hammer g, engaged by the cam, the gong h, spring g, plates 1) and i, rim 0, lock-plate m, and pin a, arranged and operating so that no action 0 can be had by the key on the locking mechanism without sounding the alarm, substantially as set forth.

GEORGE GIBBS.

Witnesses ISAAO'SMITH, JOHN INGLIS. 

